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Best way to measure piston depth in the hole? #322294 05/19/09 12:34 AM 05/19/09 12:34 AM
Joined: Sep 2005 Posts: 1,202 California P polkat OP mopar addict
polkat OP mopar addict P Joined: Sep 2005 Posts: 1,202 California	Presently I only have a dial caliper, and when I try to measure the piston depth, even on the same cylinder, I get slightly different readings. The caliper is a good one (not sloppy) so I figure that I've been holding it wrong. How do you guys do it?

Re: Best way to measure piston depth in the hole? [Re: polkat] #322295 05/19/09 12:46 AM 05/19/09 12:46 AM
Joined: Jan 2004 Posts: 27,347 Today? Who Knows? 1_WILD_RT Management Trainee
1_WILD_RT Management Trainee Joined: Jan 2004 Posts: 27,347 Today? Who Knows?	Piston rocking in the bore can effect the reading, so try to read in line with the piston pin, or some poeple prefer to take two readings in the same location, intentionally roocking the piston both directions then add both readings & divide by two... Another thing you can do & get decent results is use a feeler gauge & a good straight edge... I use my depth mic & a 1" machined bar with a hole through it.. Zero on the deck, then measure to the piston...

Re: Best way to measure piston depth in the hole? [Re: 1_WILD_RT] #322296 05/19/09 01:20 AM 05/19/09 01:20 AM
Joined: Sep 2005 Posts: 1,202 California P polkat OP mopar addict
polkat OP mopar addict P Joined: Sep 2005 Posts: 1,202 California	These pistons don't seem to move at all, at least not that I can visually see. I'll try the feeler gauge/straight edge idea. Thanks!

Re: Best way to measure piston depth in the hole? [Re: 1_WILD_RT] #322297 05/19/09 06:56 AM 05/19/09 06:56 AM
Joined: Nov 2003 Posts: 36,041 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,041 Lincoln Nebraska	Quote: use a feeler gauge & a good straight edge... I use my depth mic & a 1" machined bar with a hole through it.. Zero on the deck, then measure to the piston... The feeler gauges will get you close & a mike will get you an exact figure. live every 24 hour block of time like it's your last day on earth

Re: Best way to measure piston depth in the hole? [Re: RapidRobert] #322298 05/19/09 07:38 AM 05/19/09 07:38 AM
Joined: Oct 2003 Posts: 21,345 Marysville, O-H-I-O 70Cuda383 Too Many Posts
70Cuda383 Too Many Posts Joined: Oct 2003 Posts: 21,345 Marysville, O-H-I-O	you could pick up a cheap dial indicator and magnetic base. lay a straight edge accross the cylinder, zero the gauge, then remove the straight edge (being careful not to move the indicator) and bring the piston to TDC to take a reading. use your calipers to measure the thickness of the straight edge and subtract that from the total indicated reading on the dial indicator. should get you close enough Photobucket sucks

Re: Best way to measure piston depth in the hole? [Re: polkat] #322299 05/19/09 08:21 AM 05/19/09 08:21 AM
Joined: Oct 2003 Posts: 7,506 Az Crizila master
Crizila master Joined: Oct 2003 Posts: 7,506 Az	Quote: Presently I only have a dial caliper, and when I try to measure the piston depth, even on the same cylinder, I get slightly different readings. The caliper is a good one (not sloppy) so I figure that I've been holding it wrong. How do you guys do it? Buy depth gauge. They are not that expensive a you can use it in many areas on an engine build. Fastest 300

Re: Best way to measure piston depth in the hole? [Re: Crizila] #322300 05/19/09 11:26 PM 05/19/09 11:26 PM
Joined: Sep 2005 Posts: 1,202 California P polkat OP mopar addict
polkat OP mopar addict P Joined: Sep 2005 Posts: 1,202 California	Okay, after trying several of the methods mentioned, I seem to get a consistant .115" in all cylinders. That sound about right? Thanks!

Re: Best way to measure piston depth in the hole? [Re: polkat] #322301 05/19/09 11:35 PM 05/19/09 11:35 PM
Joined: Dec 2003 Posts: 5,314 Carstairs, Alberta, Canada dave571 master
dave571 master Joined: Dec 2003 Posts: 5,314 Carstairs, Alberta, Canada	Quote: Okay, after trying several of the methods mentioned, I seem to get a consistant .115" in all cylinders. That sound about right? Thanks! you're working on a 400 right? That is about right. I think mine varied from .100 to .115

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